US7940821B2 - Temperature compensating method of laser power in optical disk storage apparatus - Google Patents
Temperature compensating method of laser power in optical disk storage apparatus Download PDFInfo
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- US7940821B2 US7940821B2 US11/324,215 US32421506A US7940821B2 US 7940821 B2 US7940821 B2 US 7940821B2 US 32421506 A US32421506 A US 32421506A US 7940821 B2 US7940821 B2 US 7940821B2
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- 230000003287 optical effect Effects 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 42
- 230000008859 change Effects 0.000 claims description 11
- 230000004044 response Effects 0.000 abstract description 15
- 230000003247 decreasing effect Effects 0.000 description 5
- 230000006903 response to temperature Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000012886 linear function Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/068—Stabilisation of laser output parameters
- H01S5/0683—Stabilisation of laser output parameters by monitoring the optical output parameters
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
- G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/0617—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium using memorised or pre-programmed laser characteristics
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/068—Stabilisation of laser output parameters
- H01S5/06804—Stabilisation of laser output parameters by monitoring an external parameter, e.g. temperature
Definitions
- the present invention relates to a temperature compensating method of laser power in an optical disk storage apparatus. More particularly, the present invention relates to a temperature compensating method of laser power in an optical disk storage apparatus whereby input current supplied to a diode can be compensated in response to temperature changes to thereby enable to output a constant laser power in an optical disk such as a compact disk (CD) or a digital versatile disk (DVD) for recording and reproducing a predetermined information by laser.
- CD compact disk
- DVD digital versatile disk
- An optical disk storage apparatus for driving a laser diode provided at optical pickup outputs a laser.
- the laser outputted by the laser diode is irradiated on a surface of the optical disk such as a CD or a DVD serves to record or reproduce a predetermined data.
- the laser diode is driven to irradiate a very high powered laser on the optical disk.
- the optical disk is disposed with a recording layer for storing a predetermined data.
- the storage of data is made possible by change of physical properties of the recording layer, for the physical properties of the recording layer can be changed by high laser power.
- data pattern formed in the course of recording the data on the optical disk should not be damaged such that the laser diode is so driven as to output a lower laser power than that of recording the data.
- the laser power is changed in the course of recording the predetermined data on the optical disk, the laser pattern recorded on the optical disk is not constant, such that a decreased recording quality containing lots of errors occurs.
- the decreased recording quality in turn generates degradation of reproduction performance where stored data is not accurately reproduced.
- Another disadvantage is that if the laser power is not constantly maintained even during the predetermined data stored in the optical disk being reproduced, a reproduction signal level of the data is changed to disable the optical disk from reproducing a stable data.
- the optical disk storage apparatus is typically disposed therein with an automatic power control (APC) to enable to constantly maintain a laser power outputted from the laser diode.
- APC automatic power control
- the APC is generally referred to a technique for controlling an accurate output of laser power desired by a laser diode.
- the APC can now maintain an accurate and exact laser power by adopting a digital control method from an analogue control method.
- the performance of a laser diode may generally be inversely related to the ambient temperature.
- the laser power outputted from the laser diode is decreased if the ambient temperature is high while the laser power from the laser diode is increased if the ambient temperature is low.
- the input current supplied to the laser diode is increased if the ambient temperature is high, and if the ambient temperature is low, the input current supplied to the laser diode is decreased so that laser power outputted from the laser diode should be constantly maintained.
- the APC In order to output a laser power desired by a laser diode, the APC should provide an Equation of an input current under a particular temperature, i.e., a normal temperature against a voltage of laser power outputted by the laser diode, and it should be beforehand stored in an optical storage apparatus.
- the pre-stored Equation is used to calculate an input current for outputting a voltage of the laser power desired by the laser diode.
- the calculated input current is then supplied to the laser diode to allow the laser power wanted by the laser diode to be outputted.
- the laser diode is such that the laser power is variable in response to changes of the ambient temperature.
- the APC is pre-stored with an Equation relative to an arbitrary temperature, and calculates an input current of the laser diode for outputting the desired laser power by way of the stored Equation. In other words, no consideration is given to the laser power outputted from the laser diode in response to the changing ambient temperature.
- an input current capable of outputting a laser power wanted by a laser diode relative to a particular temperature corresponding to the Equation can be accurately calculated and can be supplied to the laser diode.
- the ambient temperature of the laser diode changes, it cannot be coped with, and, as a result, an input current capable of outputting a laser power desired by the laser diode cannot be accurately set up in response to the changed ambient temperature.
- Another object is to provide a temperature compensating method of laser power in an optical disk storage apparatus configured to adjust an input current of laser diode in response to temperature changes thereby disabling a laser power from being changed even if temperature is changed in the course of driving the laser diode.
- Still another object is to provide a temperature compensating method of laser power in an optical disk storage apparatus, whereby a laser diode can output a same laser power as before even if a buffer under-run occurs where a predetermined data is recorded in an optical disk and the recording is again conducted.
- a temperature compensating method of laser power in an optical disk storage apparatus comprising: obtaining an Equation of input current of laser diode-laser power voltage relative to a current temperature; and calculating an input current of the laser diode based on the Equation and supplying the input current to the laser diode.
- the method further comprises a step of a driving command of the laser diode being inputted before the obtaining the Equation wherein the driving command of the laser diode is a recording command or a reproduction command of the optical disk.
- the Equation of the input current-laser power voltage relative to the current temperature comprises: obtaining a gradient of the laser power voltage against a temperature relative to a plurality of temperatures in which the laser diode operates, and a linear Equation of a y-intercept of laser power voltage against temperature; obtaining a gradient of laser power voltage relative to the current temperature and the y-intercept by respectively substituting the current temperature for the gradient of the temperature-laser power voltage and the linear Equation of y intercept of the laser power voltage-temperature; and obtaining a linear Equation of the laser power voltage-input current by substituting the gradient of the laser power voltage relative to the current temperature and the y-intercept for the linear Equation.
- the step of obtaining the gradient of the laser power voltage-temperature relative to the plurality of temperatures and the linear Equation of y intercept of the laser power voltage-temperature comprises: detecting respective laser power voltages relative to the input current under mutually different plural temperatures; obtaining an Equation of input current under each temperature-laser power voltage by way of the laser power voltage thus detected relative to the input current, and calculating plural gradients and a y-intercept; performing a linear interpolation of the thus-calculated plural gradients and the y-intercept; and obtaining a gradient of laser power voltage-temperature and a linear Equation of y-intercept of the laser power voltage-temperature by way of the linearly interpolated plural gradients thus calculated and the y-intercept.
- the plural temperatures in which the laser diode operates comprise two temperatures selected within a range of between a minimum temperature range and a maximum temperature range in which the laser diode operates.
- the step of obtaining the gradient of the laser power voltage-temperature relative to the plural temperatures, and the linear Equation of y-intercept of the laser power voltage-temperature comprises: detecting a laser power voltage relative to input current under the plural temperatures; obtaining an Equation of laser power voltage—the input current relative to the plural temperatures by way of the input current and the laser power voltage thus detected to calculate plural gradients and y intercept; linearly interpolating the thus-calculated plural gradients and the y intercept; and obtaining a linear Equation of the y-intercept of the laser power voltage-temperature and a gradient of the laser power voltage-temperature.
- the linear interpolation of the gradient and the y-intercept is performed by one of Lagrange method, Least Mean Square Method and Newton's Method.
- the temperature compensating method of laser power in an optical disk storage apparatus further comprises: detecting whether there has occurred a temperature change following the supply of the input current to the laser diode; obtaining again an Equation of laser power voltage-input current of the laser diode relative to the changed current temperature if it is detected that the current temperature has changed; and calculating an input current of the laser diode by way of the re-obtained Equation and supplying the input current to the laser diode.
- a temperature compensating method of laser power in an optical disk storage apparatus comprises: detecting a laser power voltage outputted by a laser diode in response to plural input currents to obtain an Equation of the laser power voltage-input current relative to a current temperature; calculating the input current of the laser diode relative to a predetermined laser power voltage from the Equation of the laser power voltage-input current relative to the current temperature and supplying the input current to the laser diode.
- the temperature compensating method of laser power in an optical disk storage apparatus further comprises a driving command of the laser diode being inputted before obtaining the Equation of the laser power voltage-input current relative to the current temperature.
- the driving command of the laser diode is either a recording command or a reproduction command of the optical disk.
- the Equation of the laser power voltage-input current relative to the current temperature is obtained by detecting a laser power voltage outputted by the laser diode in response to mutually different two input currents.
- the Equation of the laser power voltage-input current relative to the current temperature comprises: detecting a laser power voltage outputted by the laser diode in response to mutually different two input currents; substituting the input current and the laser power voltage for a linear Equation to obtain a gradient of laser power voltage-input current relative to the current temperature and a y-intercept; and substituting the gradient and the y-intercept thus obtained for the linear Equation to obtain an Equation of the laser power voltage-input current relative to the current temperature.
- FIG. 1 is a graph illustrating a characteristic of laser power voltage-input current of a laser diode.
- FIG. 2 is a graph illustrating a characteristic of a gradient of laser power voltage—a lower diode temperature.
- FIG. 3 is a graph illustrating a characteristic of a y-intercept characteristic of laser power voltage-laser diode temperature.
- FIG. 4 is a graph illustrating an operation of an embodiment of a temperature compensating method according to the present invention.
- FIG. 5 is a flowchart explaining an operation of an embodiment of a temperature compensating method according to the present invention.
- FIG. 6 is a graph explaining an operation of performing a linear interpolation of a gradient characteristic of laser power voltage-temperature according to another embodiment of a temperature compensating method according to the present invention.
- FIG. 7 is a graph explaining an operation of performing a linear interpolation of a y-intercept of laser power voltage-temperature according to another embodiment of a temperature compensating method according to the present invention.
- FIG. 8 is a graph illustrating an operation of another embodiment of the present invention.
- FIG. 9 is a graph illustrating an operation of still another embodiment of a temperature compensating method according to the present invention.
- FIG. 10 is a signal flowchart illustrating an operation of still another embodiment of a temperature compensating method according to the present invention.
- FIG. 1 is a graph illustrating a characteristic of laser power voltage-input current of a laser diode, where ‘x’ axis is an input current supplied to a laser diode and ‘y’ axis denotes a laser power voltage outputted from the laser diode.
- the input current is outputted by a laser diode driving unit in response to control of a controller and supplied to the laser diode.
- the laser power voltage is such that a laser outputted by a laser diode in response to the input current is detected by a laser detector and converted to a voltage.
- the laser detector reflects to a reflector the laser outputted by the laser diode, and receives the laser reflected by the reflector by way of a Front monitor Photo Diode (FPD) to create a current in proportion to a laser power, where the created current is converted to a voltage.
- FPD Front monitor Photo Diode
- the laser power voltage has a value proportionate to a laser power outputted by the laser diode in response to the input current.
- laser power voltages V 2 and V 4 are outputted by the laser diode in case input currents I 1 and I 2 are supplied at a minimum temperature Temp 1 .
- laser power voltages V 1 and V 3 are outputted by the laser diode in case input currents I 1 and I 2 are supplied at a maximum temperature Temp 2 .
- FIG. 1 is illustrated assuming that the laser power voltage outputted by the laser diode is linearly variable in response to the input current at an arbitrary temperature between the minimum temperature Temp 1 and the maximum temperature Temp 2 .
- the laser power voltage of the laser diode outputted in response to ambient temperature is variable, such that the outputted laser power voltage is decreased as the ambient temperature rises, and is increased as the ambient temperature drops.
- a gradient of temperature-laser power voltage and a y-intercept of temperature-laser power voltage for the laser power voltage outputted by the laser diode at all temperatures in which the laser diode operates can be expressed in graphs as shown in FIGS. 2 and 3 .
- the gradient of the laser power voltage has a value between a 1 and a 2 in FIG. 2 .
- the y-intercept of the laser power voltage has a valve between b 1 and b 2 in FIG. 3 .
- a linear Equation of the gradient of temperature-laser power voltage of Formula 4 and the gradient of the y-intercept of temperature-laser power voltage of Formula 5 are stored in advance in an optical storage device.
- the laser diode is provided at an adjacent location thereof with a temperature sensor to thereby enable to detect an ambient temperature of the laser diode.
- the optical storage apparatus performs a power setting process for prompting APC to output an accurate laser power from the laser diode in case the laser diode is driven to output a laser.
- a temperature sensor detects an ambient temperature TempX of the laser diode in the first place.
- the detected ambient temperature TempX is substituted respectively for the linear Equation relative to the gradient of the temperature-laser power voltage of Formula 4 and the linear Equation relative to the y-intercept of the temperature-laser power voltage of Formula 5, where the gradient ‘c’ and the y-intercept ‘d’ of Formula 4 and the gradient ‘e’ and the y-intercept ‘f’ of Formula 5 are known values.
- a gradient ‘A’ and a y-intercept ‘B’ of the laser power voltage outputted by the laser diode relative to the ambient temperature TempX of the detected laser diode can be calculated.
- the gradient ‘A’ of the calculated laser power voltage and ‘B’ of the y-intercept are substituted for Formula 1, and then Formula 6 of linear Equation of the laser power voltage outputted by the laser diode in response to the input current relative to the detected temperature TempX can be obtained as shown in FIG. 4 .
- y Ax ⁇ B :Temp X , where a 2 ⁇ A ⁇ a 1, and b 1 ⁇ B ⁇ b 2.
- the laser diode driving unit supplies the calculated input current to the laser diode to output a laser power of level desired by the laser diode.
- FIG. 5 is a flowchart explaining an operation of an embodiment of a temperature compensating method according to the present invention.
- an optical storage apparatus discriminates whether a driving command of a laser diode has been inputted (S 500 ).
- the input of the driving command f the laser diode can be discriminated by whether a recording command or a reproduction command of the laser diode has been inputted.
- the optical storage apparatus detects the current temperature TempX by way of a temperature sensor disposed near the laser diode (S 502 ).
- the detected current temperature is substituted for the linear Equations 4 and 5 to calculate a gradient a 3 and a y-intercept b 3 of the laser power voltage outputted by the laser diode from the detected current temperature (S 504 ).
- an input current (IX) for outputting a voltage (VX) of the desired laser power is calculated (S 508 ), and the calculated input current (IX) is supplied to the laser diode to allow the laser power desired by the laser diode to be outputted (S 510 ).
- a linear Equation of the laser power voltage relative to the input current can be accurately calculated from the current temperature TempX, and the input current is determined by the calculated linear Equation and is supplied to the laser diode so that a laser power desired by the laser diode can be accurately outputted.
- the changed current temperature is substituted for linear Equations of Formulae 4 and 5 to calculate a gradient and a y-intercept of the laser power voltage outputted by the laser diode from the changed current temperature (S 504 ), and to complete Formula 6 according to the changed temperature (S 506 ).
- the input current (IX) for outputting the desired laser power voltage (VX) is calculated using Formula 6 according to the changed temperature (S 508 ) and is supplied to the laser diode to allow the laser power desired by the laser diode to be outputted (S 510 ).
- non-linearly changed gradient and y-intercept be linearly converted and stored in an optical storage apparatus.
- a temperature was arbitrarily changed within a temperature range between the minimum temperature Temp 1 and the maximum temperature Temp 2 of the laser diode, and a laser power voltage outputted by the laser diode in response to the input current was measured.
- Gradients and y-intercepts of the laser power voltage thus measured are detected to obtain a non-linear graph as shown in dotted lines of FIGS. 6 and 7 .
- the gradients and the y-intercepts of the laser power voltages are measured from at least 20 or more mutually different detected temperatures.
- the measured gradients and y-intercepts of the non-linear graph were linearly interpolated by use of linear interpolation method.
- the linear interpolation uses, for example, one of many linear interpolation methods including Lagrange method, Least Mean Square Method and Newton's Method.
- the Formulae 7 and 8 thus obtained are stored in advance on an optical storage apparatus.
- a current temperature is detected by a temperature sensor as depicted in FIG. 5 , and the detected current temperature is substituted for Formulae 6 and 7 to obtain a linearly interpolated gradient and y-intercept.
- the obtained gradient and y-intercept are substituted for Formula 1, and for example, Formula 8 which is a relation of Equation of input current-laser power voltage relative to the current temperature TempX is completed as shown in FIG. 9 .
- Y A — Lx ⁇ B — L :Temp X
- an input current of the laser power voltage outputted by the laser diode is calculated from the current temperature, and the calculated input current is supplied to the laser diode to prompt a desired laser power to be outputted.
- FIG. 9 is a graph illustrating an operation of still another embodiment of a temperature compensating method according to the present invention.
- arbitrary input currents I 1 and I 2 are supplied to a laser diode from a current temperature at the start of operating the laser diode. If the arbitrary input currents I 1 and I 2 are to be supplied, laser power voltages VX 1 and VX 2 outputted by the laser diode are respectively detected.
- VX 1 aI 1 ⁇ b
- VX 2 aI 2 ⁇ b
- Formula 11 where the input currents I 1 and I 2 and the laser power voltages VX 1 and VX 2 are already known values, and a gradient and a y-intercept are obtained using Formulae 10 and 11.
- the obtained gradient and y-intercept are substituted for Formula 1 to complete Formula 11 which is a linear Equation of the laser power voltage relative to the input current value under a current temperature.
- y a 3 x ⁇ b 3
- Formula 12 where a 3 denotes a gradient of a 2 ⁇ a 3 ⁇ a 1 , and b 3 is a y-intercept of b 1 ⁇ b 3 ⁇ b 2 .
- an optical storage apparatus discriminates a necessary laser power voltage, and an input current for creating the discriminated laser power voltage is calculated by Formula 12.
- the calculated input current is supplied to the laser diode to allow a desired laser power to be outputted.
- FIG. 10 is a signal flowchart illustrating an operation of still another embodiment of a temperature compensating method according to the present invention.
- an optical storage apparatus discriminates whether a driving command of the laser diode has been inputted (S 1000 ).
- the input of the driving command of the laser diode can be discriminated by whether a recording command or a reproduction command of the optical disk has been inputted.
- the optical storage apparatus supplies the input current I 1 to the laser diode to detect the laser power voltage VX 1 outputted from the laser diode (S 1002 ).
- the optical storage apparatus then supplies the input current I 2 to the laser diode to detect the laser power voltage VX 2 outputted from the laser diode (S 1004 ).
- the input currents I 1 and I 2 , and the laser power voltages VX 1 and VX 2 are respectively substituted for x value and y value of Formula 1 to obtain two Formulae, and a gradient and a y-intercept are obtained using the obtained two Formulae (S 1006 ).
- the laser power voltage is discriminated according to the inputted driving command (S 1010 ).
- the laser power voltage is established in advance according to the driving command. For example, a predetermined data is to be recorded on an optical disk, the laser power voltage is established at a high level, and if a predetermined data stored in an optical disk is to be reproduced, a lower level of laser power voltage is established than that of the recording.
- the optical storage apparatus discriminates an operation according to the inputted driving command, and again discriminates the laser power voltage for performing the discriminated operation.
- the discriminated laser power voltage is substituted for Formula 11 to calculate an input current of the laser diode (S 1012 ), where the calculated input current is supplied to the laser diode to allow a laser power voltage desired by the laser diode to be outputted (S 1014 ).
- a linear Equation of a laser power voltage outputted by a laser diode in response to temperature changes is obtained, and an input current is calculated by the linear Equation, which is supplied to a laser diode.
- an accurate input current can be calculated and supplied so that a laser power desired by a laser diode can be outputted to conform to the temperature changes in driving the laser diode.
- an input current can be re-calculated and supplied to a laser diode even if a temperature is changed when a predetermined data is recorded on or reproduced from an optical disk. Consequently, even if the temperature is changed in the course of the predetermined data being recorded on or reproduced from the optical disk, the laser diode can output a constant laser power, thereby enabling to perform stable recording and reproducing operations.
- the laser diode can calculate an input current for outputting a same laser power as before and supply it. Therefore, deterioration of recording quality caused by temperature changes can be avoided in advance to enable to guarantee certified recording and reproducing performances.
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Abstract
Description
y=a1x−b1:Temp1 Formula 2
Y=a2x−b2:Temp2 Formula 3
B=eTempX+f, Formula 5
where ‘e’ and ‘f’ respectively denote a gradient and a y-intercept, and TempX is temperature.
y=Ax−B:TempX, where a2≦A≦a1, and b1≦B≦b2. Formula 6
A — L=c — L·TempX+d — L, Formula 7
where c_L and d_L are a gradient and a y-intercept in the linearly interpolated graph of
B — L=e — L·TempX+f — L, Formula 8
where e_L and f_L respectively denote a gradient and a y-intercept in the linearly interpolated graph of
Y=A — Lx−B — L:TempX Formula 9
VX1=aI1−b Formula 10
VX2=aI2−b,
where the input currents I1 and I2 and the laser power voltages VX1 and VX2 are already known values, and a gradient and a y-intercept are obtained using
y=a3x−b3,
where a3 denotes a gradient of a2≦a3≦a1, and b3 is a y-intercept of b1≦b3≦b2.
Claims (3)
Applications Claiming Priority (9)
Application Number | Priority Date | Filing Date | Title |
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KR898/2005 | 2005-01-05 | ||
KR899/2005 | 2005-01-05 | ||
KR10-2005-0000898 | 2005-01-05 | ||
KR1020050000898A KR20060080621A (en) | 2005-01-05 | 2005-01-05 | Recording Power Compensation Method by Temperature Change of Recordable Optical Storage Device |
KR1020050000899A KR100610348B1 (en) | 2005-01-05 | 2005-01-05 | Recording power linear interpolation method according to temperature change of recordable optical storage device |
KR10-2005-0000899 | 2005-01-05 | ||
KR2252/2005 | 2005-01-10 | ||
KR10-2005-0002252 | 2005-01-10 | ||
KR1020050002252A KR20060081826A (en) | 2005-01-10 | 2005-01-10 | Recording power linear interpolation method according to temperature change of recordable optical storage device |
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US20060146894A1 US20060146894A1 (en) | 2006-07-06 |
US7940821B2 true US7940821B2 (en) | 2011-05-10 |
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Cited By (1)
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US8605764B1 (en) | 2012-07-09 | 2013-12-10 | Microvision, Inc. | Laser diode junction temperature compensation |
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TWI311752B (en) * | 2006-03-16 | 2009-07-01 | Sunplus Technology Co Ltd | Laser power control device and method for an optical disk recording apparatus |
JP5659476B2 (en) * | 2009-09-25 | 2015-01-28 | ソニー株式会社 | Correction circuit, drive circuit, and light emitting device |
JP2012209501A (en) * | 2011-03-30 | 2012-10-25 | Sony Corp | Correction circuit, driving circuit, light emitting apparatus, and method of correcting electric current pulse waveform |
US10651626B2 (en) * | 2018-08-10 | 2020-05-12 | Microsoft Technology Licensing, Llc | Laser control |
CN113452390B (en) * | 2021-06-25 | 2022-10-21 | 展讯通信(上海)有限公司 | Power compensation method, device, storage medium and electronic equipment |
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US5019769A (en) * | 1990-09-14 | 1991-05-28 | Finisar Corporation | Semiconductor laser diode controller and laser diode biasing control method |
US5761230A (en) * | 1995-05-22 | 1998-06-02 | Nec Corporation | Laser-diode driving circuit with temperature compensation |
US20020087281A1 (en) * | 1997-12-24 | 2002-07-04 | More Edward S. | Method and apparatus for economical drift compensation in high resolution measurements |
US20030035451A1 (en) * | 2001-08-09 | 2003-02-20 | Masaaki Ishida | Laser driver circuit |
-
2006
- 2006-01-04 US US11/324,215 patent/US7940821B2/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5019769A (en) * | 1990-09-14 | 1991-05-28 | Finisar Corporation | Semiconductor laser diode controller and laser diode biasing control method |
US5761230A (en) * | 1995-05-22 | 1998-06-02 | Nec Corporation | Laser-diode driving circuit with temperature compensation |
US20020087281A1 (en) * | 1997-12-24 | 2002-07-04 | More Edward S. | Method and apparatus for economical drift compensation in high resolution measurements |
US20030035451A1 (en) * | 2001-08-09 | 2003-02-20 | Masaaki Ishida | Laser driver circuit |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8605764B1 (en) | 2012-07-09 | 2013-12-10 | Microvision, Inc. | Laser diode junction temperature compensation |
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